Define Powder Your Nose Meaning

Guy: How long has it been since you went to powder your nose?
Bob: Quite some time now

Bill: This club is great, but lets go to the bathroom for a sec.
Lisa: What for? U think I'm gonna fuck you or something?
Bill: I'm gonna be powdering your nose. U wanna try it?
Lisa: I could do a few lines.
Bill: Cool. Keep it on the DL, let's go